JP2019162325A - Washing machine - Google Patents

Abstract

To effectively prevent dirt from reattaching to clothing in a washing tub while capable of automatically performing tub washing.SOLUTION: A washing machine includes: a water tub; a washing tub which is provided in the water tub and in which clothing is stored; a drainage mechanism for draining water form the washing tub; a drive mechanism for rotationally driving the washing tub; and a control device for executing the steps of washing, rinsing and dewatering by controlling each mechanism. The control device executes a residual water dewatering operation including an acceleration section in which, between stored water rinsing and the following drainage during the rinsing step, in a state where water of a predetermined water level remains in the washing tub, the washing tub is accelerated and rotated to the target rotational frequency, and a deceleration section in which the washing tub is decelerated and rotated from the target rotational frequency while performing drainage by the drainage mechanism. The control device makes the degree of deceleration in the deceleration section smaller than the degree of deceleration at the deceleration time in a normal dewatering step.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a washing machine.

  For example, in a so-called vertical axis type washing machine in which a washing tub also serving as a dehydration tub is provided in the water tub so as to be rotatable about a vertical axis, dirt is present in places that are difficult for the user to see such as the outer peripheral surface of the washing tub and the inner surface of the water tub. And there is a problem that the detergent residue adheres. If such dirt is left unattended, black mold or the like is generated, causing problems such as odor generation and reattachment to clothing. Therefore, conventionally, a hydrophilic performance film is provided on the outer surface of the washing tub (rotary tub), and in the washing operation process, after the final rinsing process (after draining), a washing process is performed to wash the outer surface of the washing tub. Thereafter, it has been proposed to shift to the final dehydration process (see, for example, Patent Document 1). This washing process is performed by rotating the washing tub at a high speed in a state where water is stored in the water tub near the balance ring, and after a predetermined time has elapsed, the rotation of the washing tub is stopped and drainage is performed.

JP 2015-47233 A

  However, in the above washing process, water (washing water) that contributes to washing the washing tub accumulates at the bottom of the washing tub when the washing tub stops rotating, and clothes in the washing tub are immersed in the washing water. become. Therefore, there is a possibility that the dirt contained in the washing water may be reattached to the clothes in the washing tub.

  Therefore, a washing machine is provided that can effectively prevent the reattachment of dirt to the clothes in the washing tub while performing the tub washing automatically.

  The washing machine of the embodiment includes a water tub, a washing tub provided inside the water tub and storing clothes, a drainage mechanism that drains water from the laundry tub, a drive mechanism that rotationally drives the laundry tub, A control device for controlling each mechanism to perform washing, rinsing, and dewatering processes, and the control device is provided in the washing tub during the rinsing process between the rinsing and the subsequent drainage. An acceleration section for accelerating rotation of the washing tub to a target rotational speed while water at a water level remains, and a deceleration section for rotating the laundry tub at a reduced speed from the target rotational speed while draining by the drainage mechanism In addition, the remaining water dewatering operation is performed, and the deceleration rate in the deceleration zone is made smaller than the deceleration rate during deceleration in the normal dewatering stroke.

1 is a longitudinal side view schematically showing a configuration of a washing machine according to the first embodiment. Diagram showing electrical configuration schematically The figure which shows the control state in the rinse process which a control apparatus performs The 2nd Embodiment is a figure showing the control state in the rinse process which a control device performs The figure which shows 3rd Embodiment and shows the list of the execution time of the deceleration area according to the cloth quality and the cloth amount. The figure which shows 4th Embodiment and shows the list | wrist of the addition time of the deceleration area according to drainage capacity

  Hereinafter, some embodiments applied to a so-called vertical washing machine will be described with reference to the drawings. In addition, between several embodiment, the same code | symbol is attached | subjected to the same part and new illustration and repeated description are abbreviate | omitted.

(1) First Embodiment A first embodiment will be described with reference to FIGS. FIG. 1 schematically shows the internal configuration of the washing machine 1 according to the present embodiment. First, the overall configuration of the washing machine 1 will be described. Here, the washing machine 1 includes a top cover 3 made of a synthetic resin, for example, on an upper portion of an outer box 2 that is configured as a rectangular box as a whole from a steel plate.

  A water tub 4 capable of storing washing water is provided in the outer box 2 by being elastically suspended and supported by an elastic suspension mechanism 5 having a well-known configuration. A drain port 6 is formed at the bottom of the water tank 4. A drainage channel 8 having an electronically controlled drainage valve 7 is connected to the drainage port 6. A drainage mechanism is constituted by the drainage valve 7 and the like. Although not shown in detail, an air trap is provided at the bottom of the water tub 4, and a water level sensor 9 (for detecting the water level in the water tub 4 (washing tub 10) through an air tube connected to the air trap). 2). Further, a drainage hose or the like is connected to the drainage channel 8, and drainage to the outside is performed.

  In the water tank 4, a vertical washing tank 10 also serving as a dewatering tank is rotatably provided. The washing tub 10 has a bottomed cylindrical shape, and a large number of dewatering holes 10a are formed in the peripheral wall portion. For example, a liquid-filled rotary balancer 11 is attached to the upper end of the washing tub 10. Further, a pulsator 12 as a stirring body is disposed at the inner bottom of the washing tub 10. Clothes (not shown) are accommodated in the washing tub 10, and a washing operation including processes such as washing, rinsing and dehydration of clothes is performed.

  A water tank cover 13 is attached to the upper part of the water tank 4. The water tank cover 13 is provided with an opening 13a for loading and unloading the laundry substantially at the center, and an inner lid 14 for opening and closing the opening 13a is attached. Further, a water supply port 20 for supplying water into the water tank 4 by a water supply mechanism which will be described later is provided in a portion near the rear part of the water tank cover 13. An overflow port 4 a is provided at a position higher than the highest water level of the washing tub 10 at the upper part of the back wall portion of the water tub 4. On the outside of the water tank 4, an overflow hose 22 is provided continuously to the overflow port 4a for discharging the overflowed water from the overflow port 4a. Although not shown in detail, the tip of the overflow hose 22 is connected to the drainage channel 8.

  A drive mechanism 15 having a known configuration is disposed on the outer bottom of the water tank 4. Although detailed illustration and description are omitted, the drive mechanism 15 includes, for example, a washing machine motor 16 (see FIG. 2) formed of an outer rotor type DC three-phase brushless motor, a hollow tank shaft 18, and a stirring penetrating through the tank shaft 18. A shaft 19 and a clutch mechanism 17 (see FIG. 2) for selectively transmitting the rotational driving force of the washing machine motor 16 to the shafts 18 and 19 are provided. The washing tub 10 is connected to the upper end of the tank shaft 18, and the pulsator 12 is connected to the upper end of the stirring shaft 19. As shown only in FIG. 2, the drive mechanism 15 includes a rotation sensor 31 that detects the rotation position (and hence the rotation speed) of the washing machine motor 16, and a current sensor 32 that detects a current flowing through the washing machine motor 16. Is also provided.

  The clutch mechanism 17 has a well-known configuration using, for example, a solenoid as a drive source, and is switched and controlled by a control device 21 configured mainly with a computer. As is well known, the clutch mechanism 17 allows the washing tub 10 to rotate and transmits the rotational force of the washing machine motor 16 to both the tub shaft 18 and the stirring shaft 19, and the washing tub 10 to the water tub 4. On the other hand, the state is locked to the fixed state, and the state in which the rotational force of the washing machine motor 16 is transmitted only to the stirring shaft 19 is switched. At this time, the washing machine motor 16 directly drives the washing tub 10 (and the pulsator 12), and the rotation speed of the washing machine motor 16 becomes equal to the rotation speed of the washing tub 10. The mechanism for locking / unlocking the washing tub 10 in a fixed state is connected / disengaged by the meshing of the tooth portions, so that the resistance of the washing tub 10 in the rotational direction is smaller (smoothly rotates) and the clutch is switched. The structure is easy to break.

  Thus, the drive mechanism 15 causes the driving force of the washing machine motor 16 to pass through the stirring shaft 19 while the washing tub 10 is fixed (stopped) by the clutch mechanism 17 during washing and rinsing (washing process). And transmitted to the pulsator 12 to directly drive the pulsator 12 forward and reverse. Further, the drive mechanism 15 is configured to apply the driving force of the washing machine motor 16 via the tank shaft 18 while the tank shaft 18 and the stirring shaft 19 are connected by the clutch mechanism 17 during dehydration (dehydration process) or the like. The washing tub 10 (and the pulsator 12) is directly driven to rotate in one direction at a high speed. The control device 21 (electronic unit) is provided at the lower part of the rear wall in the outer box 2.

  The top cover 3 has a thin hollow box shape whose lower surface is opened and whose upper surface is inclined downward toward the front, and has a central portion above the washing tub 10 (water tank cover 13). A substantially circular laundry entrance / exit 3a is formed at a position above the opening 13a. On the upper surface of the top cover 3, a rectangular panel is formed as a whole, and a lid 23 for opening and closing the entrance 3a is provided.

  A horizontally long operation panel 24 is provided on the front side of the top surface of the top cover 3. Although not shown in detail, the operation panel 24 includes an operation unit for the user to turn on and off the washing machine 1 and various settings / instructions, a display unit for performing necessary display, and the like. Yes. At this time, in addition to the standard course, the washing machine 1 is provided with a plurality of automatic driving courses such as a blanket course, a speed course, a careful course, and the user wants to execute the laundry course by operating the operation panel 24. Can be set.

  A water supply mechanism 25 for supplying water supplied from a water supply source, in this case water supply, into the water tank 4 (washing tub 10) through a water supply path is provided at the rear portion of the top cover 3. The water supply mechanism 25 includes a connection port 26, a water supply valve 27, a water injection case 28, a water supply hose 29, and the like. Of these, the connection port 26 is connected to the tip of a connection hose connected to a water tap (not shown). The water supply valve 27 is an open / close valve that opens and closes electromagnetically, and is controlled by the control device 21. The tip of the water supply hose 29 is connected to the water supply port 20 of the water tank cover 13.

  Thus, when the water supply valve 27 is opened, water passes through the water supply case 28 and the water supply hose 29 in order, and is supplied into the water tank 4 from the water supply port 20. Although not shown in the drawings, a drawer-type detergent container or the like is provided in the water injection case 28, and when detergent is stored in the detergent container, water is supplied while dissolving the detergent.

  FIG. 2 schematically shows the electrical configuration of the washing machine 1 with the above-described control device 21 as the center. The control device 21 is mainly configured by a microcomputer including a CPU, a ROM, a RAM, and the like, and controls the entire washing machine 1 to execute each step of the washing operation. The control device 21 receives an operation signal from the operation panel 24 and controls display on each display unit of the operation panel 24. The control device 21 is supplied with a water level detection signal in the washing tub 10 detected by the water level sensor 9 and detection signals from the rotation sensor 31 and the current sensor 32.

  The control device 21 drives and controls the washing machine motor 16 and the clutch mechanism 17 and controls the water supply valve 27 and the drain valve 7. With the above configuration, the control device 21 controls each mechanism of the washing machine 1 based on input signals from each sensor and a pre-stored control program in accordance with a user's setting operation of the washing course on the operation panel 24. Control. For example, in a well-known automatic driving course, a washing operation including washing, rinsing, and dehydration processes is executed. In this case, in the rinsing process, for example, a dehydration rinsing (intermediate dehydration) operation and a rinsing operation are sequentially executed. Therefore, after the rinsing operation, the draining operation is performed and the final dehydration process is started.

  In executing the automatic driving course, the control device 21 executes the cloth amount detection operation and the cloth quality determination operation of the clothes in the washing tub 10 at the start of the operation. The cloth quality determination operation determines whether the clothing is mainly made of a cotton product or a synthetic fiber product. Based on the results of the cloth amount detection operation and the cloth quality determination operation, the water level at the time of washing and rinsing is set in a plurality of stages (for example, six stages of 15, 20, 30, 40, 50, and 60 liters). At the same time, the execution time of each process, the strength of the water flow, etc. are automatically set. Water supply control into the washing tub 10 is performed based on the water level detection of the water level sensor 9.

  At this time, as is well known, the cloth amount detection operation is performed by rotating the pulsator 12 for a short time by the drive mechanism 15 in a state before water supply to the aquarium 4, and the current flowing through the washing machine motor 16 at that time is measured by a current sensor. This is performed based on the detection by 32. In the cloth quality determination operation, the pulsator 12 is driven to rotate for a short time by the drive mechanism 15 while water is supplied to the cloth quality detection water level in the water tank 4, and the rotation speed of the washing machine motor 16 is determined by the rotation sensor 31. Is detected and compared with the determination table. Therefore, the control device 21, the current sensor 32, the rotation sensor 31 and the like constitute a cloth amount detection means and a cloth quality detection means.

  In the present embodiment, as will be described in detail in the next operation description (description of FIG. 3), the control device 21 mainly performs the rinsing and subsequent drainage during the rinsing process mainly by the software configuration. In the meantime, residual water dewatering operation for tank cleaning is executed. In this case, at the time of drainage after rinsing, drainage is stopped in a state where the inside of the washing tub 10 (water tank 4) is at a predetermined water level (for example, 25 liters). The residual water dewatering operation is started in a state where water of a predetermined water level remains in the washing tub 10.

  In the residual water dewatering operation, the laundry tub 10 starts rotating and is accelerated to a target rotational speed (for example, 150 rpm), and the laundry tub 10 is rotated at a constant speed of the target rotational speed for a predetermined time (for example, 30 seconds). A constant speed section and a deceleration section in which the washing tub 10 is decelerated and rotated from the target rotational speed and stopped are sequentially executed. At this time, the drain valve 7 is opened in the latter half of the constant speed section, and the deceleration section is executed while draining by the drain mechanism. As a result, at the end of the residual water dewatering operation, the water level in the washing tub 10 drops to near the reset water level (water level below the pulsator 12).

  In the present embodiment, in the acceleration section of the residual water dewatering operation, acceleration is performed quickly in the same manner as in the normal dewatering process. For example, the washing tub 10 is moved from the rotational speed 0 to the target rotational speed (150 rpm) for several seconds (5 ). And in the said deceleration area, the deceleration degree is made smaller than the deceleration degree at the time of deceleration in a normal dehydration process. In the present embodiment, the washing tub 10 is gradually decelerated over about 30 to 40 seconds until the washing tub 10 is stopped from the target rotation speed (150 rpm). After the remaining water dewatering operation is completed, the drainage operation is continued for a certain time, and then the final dewatering process is started.

  Next, the operation of the washing machine 1 configured as described above will be described mainly with reference to FIG. FIG. 3 shows the state of control from the final stage of the rinsing process performed by the control device 21. That is, with the passage of time, the open / close state of the water supply valve 27, the water level of the washing tub 10, the open / close state of the drain valve 7, the switching state of the clutch mechanism 17 (whether the washing tub 10 side or the pulsator 12 side), the washing machine motor 16 ( The state of the change of the rotation speed of the washing tub 10) is shown.

  Here, at the end of the rinsing process (time T1), the water level of the washing tub 10 is predetermined and thus the rinsing water level, and the drain valve 7 is closed. The clutch mechanism 17 is on the pulsator 12 side, and the washing machine motor 16 is stopped (rotation speed is 0 rpm). Therefore, when rinsing is completed, the clutch mechanism 17 is switched to the washing tub 10 side. When the switching of the clutch mechanism 17 is completed (time T2), the drain valve 7 is opened and drainage is started. By this draining operation, the water level in the washing tub 10 is gradually lowered.

  This draining operation is performed until the water level in the washing tub 10 decreases to a predetermined water level (for example, 25 liters). When the water level sensor 9 detects the predetermined water level (time T3), the drain valve 7 is closed. As a result, the draining operation is completed, and the operation proceeds to the remaining water dewatering operation. The residual water dewatering operation is started in a state where the water level of the washing tub 10 is a predetermined water level, the drain valve 7 is closed, and the clutch mechanism 17 is on the washing tub 10 side. First, the meshing operation of the clutch mechanism 17 is performed by rotating the washing machine motor 16 in the reverse direction for a short time (time T4). Subsequently, the washing machine motor 16 is rotated in the forward direction to start the rotation of the washing tub 10, and an acceleration section for accelerating rotation to a target rotation speed (for example, 150 rpm) is started.

  As described above, in this acceleration section, the acceleration is performed at a high acceleration similarly to the normal dehydration process, and the washing machine motor 16 (washing tub 10) is rotated from 0 to the target rotation speed in several seconds (for example, about 5 seconds). (150 rpm) is reached (time T5). When the washing machine motor 16 (washing tub 10) reaches the target rotational speed, a constant speed section is started in which the washing tub 10 is rotated at a constant speed of the target rotational speed for a certain time (until time T7, for example, about 30 seconds).

  Thereby, the washing tub 10 rotates and a water flow is generated between the inner wall surface of the water tub 4 and the outer peripheral surface of the dewatering tub 10, and the outer peripheral surface of the washing tub 10 and the inner surface of the water tub 4 are washed with the water flow. Further, due to the centrifugal force accompanying the rotation of the washing tub 10, the pressure of water toward the outer peripheral side of the washing tub 10 and hence the inner surface of the water tub 4 is increased, and effective cleaning is performed. Furthermore, the centrifugal force causes the water surface in the washing tub 10 to rise in a so-called bowl shape on the outer peripheral side, so that the washing tub 10 and the water tub 4 can be cleaned to a relatively high position, that is, the lower portion of the overflow port 4a. .

  At this time, the drain valve 7 is opened in the latter half of the constant speed section (time T6). Thereby, drainage from the inside of the washing tub 10 proceeds and the water level gradually decreases. When the constant speed section ends (time T7), the deceleration section starts. This deceleration section is a section in which the washing tub 10 is decelerated from the target rotational speed and stopped, but the deceleration degree at that time is smaller than the deceleration degree during deceleration in the normal dehydration process, and is relatively gentle. Deceleration is performed by gradually decreasing the rotation speed over about 30 to 40 seconds. In FIG. 3, the degree of deceleration (inclination) in the normal dehydration process is indicated by a broken line A, and the degree of deceleration (inclination) in the deceleration section of the present embodiment is indicated by a solid line B.

  Since this deceleration section is executed while draining water from the washing tub 10, the water level in the washing tub 10 decreases to near the reset water level (water level below the pulsator 12). When the rotation speed of the washing machine motor 16 (washing tub 10) reaches 0 rpm (time T8), the deceleration section ends and the residual water dewatering operation ends. At this time, the water level in the washing tub 10 is a low water level close to the reset water level. Thereafter, the draining operation with the drain valve 7 open is performed for a certain time (time T9), and the process proceeds to the final dehydration process.

  Here, in the residual water dewatering operation, in a constant speed section where the rotation speed of the washing tub 10 becomes high, a phenomenon occurs in which water is raised in a mortar shape on the outer peripheral side of the washing tub 10 (water tub 4) due to centrifugal force. The deceleration section is performed while draining water from the washing tub 10, but if the deceleration section is executed so that the degree of deceleration becomes relatively steep, for example, as in the dehydration process, the drainage will not be in time and the lift will rise. There is a possibility that the water, that is, the water containing dirt may return to the washing tub 10 and come into contact with the clothes to contaminate the clothes.

  However, in the present embodiment, since the degree of deceleration in the deceleration section is made smaller than the degree of deceleration during deceleration in the normal dehydration process, it takes time for the washing tub 10 to be lowered to a low speed, and the drainage is advanced. Time can be secured. Therefore, when the washing tub 10 is lowered to a low rotation, almost no water remains in the washing tub 10, that is, the water level is below the pulsator 12, and the water used for washing the tub is applied to the clothes. It is possible to suppress contact.

  As described above, according to the present embodiment, by performing the residual water dehydrating operation, it is possible to wash a portion where dirt such as the outer surface of the washing tub 10 and the inner surface of the water tub 4 easily adheres with a water flow. Since a separate tank cleaning course is not provided and executed, the tank cleaning is automatically performed without making the user feel bothersome, so that the outer surface of the washing tub 10 and the inner surface of the water tub 4 are always provided. Can be kept clean. And it can suppress that the water used for the tank washing | cleaning in residual water dehydration operation contacts clothing. As a result, it is possible to obtain an excellent effect of being able to effectively prevent the reattachment of dirt to the clothes in the washing tub 10 while performing the tub cleaning automatically.

(2) Second Embodiment Next, a second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in the state of control of the residual water dewatering operation performed by the control device 21 in the rinsing process. That is, in the second embodiment, a standby time is provided in which the rotational speed of the washing machine motor 16 (washing tub 10) is maintained at a constant state lower than the target rotational speed in the middle of the deceleration section of the residual water dewatering operation. ing. Thereby, the deceleration degree in a deceleration area is smaller than the deceleration degree at the time of deceleration in a normal dehydration stroke. In FIG. 4, the degree of deceleration (inclination) in the normal dehydration process is indicated by a broken line A, and the degree of deceleration in the deceleration section of the present embodiment is indicated by a solid line C.

  Specifically, in the residual water dewatering operation, the acceleration section and the constant speed section are executed in the same manner as in the first embodiment, and when the constant speed section ends (time T7), the deceleration section is started. In the deceleration zone, first, the washing machine motor 16 (washing tub 10) is gradually decelerated from a target rotational speed (for example, 150 rpm). When the rotational speed of the washing machine motor 16 (washing tub 10) reaches a predetermined rotational speed (for example, 30 rpm) lower than the target rotational speed (time T11), a standby time for maintaining the rotational speed is a predetermined time. (For example, about 20 seconds). When the predetermined time has elapsed (time T11), the washing machine motor 16 (washing tub 10) is stopped, and the residual water dewatering operation is completed.

  According to this configuration, by providing a waiting time in the deceleration zone, it is possible to secure a sufficient time for the drainage from the washing tub 10 to be prevented and to prevent the water used for the tub cleaning from contacting the clothing. be able to. Therefore, also in the second embodiment, it is possible to obtain an excellent effect of being able to effectively prevent the reattachment of dirt to the clothes in the washing tub 10 while being able to perform the tub cleaning automatically. it can. In particular, in the present embodiment, since the drainage time is earned by providing a standby time, control to increase or decrease the standby time according to the progress of drainage (drainage capacity or actual water level, etc.). It is possible to do this, and it becomes more effective.

(3) Third Embodiment Next, a third embodiment will be described with reference to FIG. The third embodiment differs from the first embodiment in the state of control of the residual water dewatering operation performed by the control device 21 in the rinsing process. In the present embodiment, the control device 21 sets the deceleration section when performing the residual water dehydrating operation depending on the amount of cloth of the clothes in the washing tub 10, the cloth quality, and whether the course being executed is a standard course or a blanket course. The time required, that is, the time required from the target rotation speed of the washing tub 10 to the stop is changed. In changing the time of the deceleration section, the degree of deceleration (inclination) may be changed, or the length of the standby time may be changed.

  That is, as described above, at the start of the washing operation, the setting of the washing course is performed, and the cloth amount detection operation and the cloth quality determination operation by the control device 21 are executed. And the control apparatus 21 lengthens the time of the deceleration area of residual water dehydration operation compared with the case where there is much detected cloth amount. In this case, the amount of cloth is determined in three stages: small, normal, and large. At the same time, the control device 21 detects that the cloth quality of the detected clothes is difficult to drain water, in this case cotton, the cloth quality that allows water to drain easily. Increase the waiting time. In addition, in the blanket course, the object to be washed is a blanket, and the cloth quality is the least likely to drain water.

  Specifically, as shown in FIG. 5, the time of the deceleration zone of the residual water dewatering operation is set. When the standard course is selected, when the fabric quality is synthetic fiber, it is 20 seconds when the amount of fabric is small, 30 seconds when normal, and 40 seconds when many. When the cloth quality is cotton, it is 30 seconds when the amount of cloth is small, 40 seconds when it is normal, and 60 seconds when it is large. When the blanket course is selected, the time of the deceleration section of the residual water dewatering operation is 90 seconds.

  Here, if the clothes in the washing tub 10 increase, the amount of water contained in the clothes also increases, and accordingly, the time required for draining becomes longer compared to the case where the amount of cloth is small. Therefore, when the detected amount of cloth is large, the effect of preventing the reattachment of dirt to clothes in the washing tub 10 can be further enhanced by lengthening the time of the deceleration section as compared with the case where the amount of cloth is small. it can. When the amount of cloth is small, the time for the deceleration section is relatively short, so that the time for the residual water dewatering operation is not unnecessarily prolonged.

  Moreover, if the cloth quality of the clothes in the washing tub 10 is difficult to drain water, the time required for draining will be longer than that in other cases. Therefore, in the case where the cloth quality of the determined clothing is cotton which is difficult to drain water, the time in the deceleration section is increased by increasing the time of the deceleration section as compared with the case of synthetic fiber which is a cloth quality which easily drains water. The effect of preventing reattachment of dirt to clothing can be further enhanced. In the case of a fabric that easily drains water, the time for the deceleration section is relatively short, so that the time for the residual water dewatering operation is not unnecessarily prolonged. In the case of the blanket that is most difficult to drain water, the effect of preventing the reattachment of dirt to the blanket in the washing tub 10 is excellent by making the time of the deceleration section the longest.

  In the third embodiment as well, as in the first embodiment and the like, the tank cleaning can be performed automatically, and the reattachment of dirt to the clothes in the washing tub 10 is effectively prevented. It is possible to obtain an excellent effect of being able to. In particular, in this embodiment, since the time of the deceleration section is changed according to the amount and quality of clothing, more effective tank cleaning can be performed according to the amount and quality of clothing.

(4) Fourth Embodiment and Other Embodiments FIG. 6 shows a fourth embodiment. In the fourth embodiment, the control device 21 determines the drainage capacity of the drainage mechanism, and when the drainage capacity is low, the control unit 21 lengthens the time of the deceleration section of the residual water dewatering operation compared to when the drainage capacity is high. It is configured as follows. In changing the time of the deceleration section, the degree of deceleration (inclination) may be changed, or the length of the standby time may be changed. Moreover, in this embodiment, the drainage capacity of the drainage mechanism is indicated by the blockage rate of the drainage hose, and the drainage capability is reduced as the blockage rate increases.

  Specifically, as shown in FIG. 6, when the drainage hose blockage rate is less than 60%, the added value of the time of the deceleration zone is set to 0 second, that is, the time of the set deceleration zone. The When the blockage rate of the drainage hose is 60% or more and less than 80%, 30 seconds is added to the set time of the deceleration zone. When the blocking rate of the drainage hose is 80% or more and less than 90%, 60 seconds is added to the set time of the deceleration zone. When the blocking rate of the drain hose is 90% or more, the process is skipped, that is, the residual water dehydrating operation itself is not executed. When the blocking rate of the drainage hose is 90% or more, for example, a drainage groove is clogged on the display unit of the operation panel 24, and a message prompting cleaning may be displayed.

  As a method for determining the drainage capacity of the drainage mechanism described above, the following configuration can be adopted. That is, the controller 21 determines that the water level in the washing tub 10 detected by the water level sensor 9 is changed from the first predetermined water level to the second predetermined water level at the time of drainage after the rinsing process (or at the time of drainage after the washing process). The drainage capacity can be determined by measuring the time required for the reduction. You may memorize | store the last drainage capacity, and you may make it determine every time. Accordingly, the control device 21, the water level sensor 9 and the like constitute a drainage capacity determining means.

  Here, in the washing machine, the drainage capacity fluctuates mainly due to the installation (use) environment and circumstances such as the clogging of the drainage channel 8 and the drainage hose after use, etc., which may be mainly reduced. Depending on the drainage capacity, the way in which water is reduced per hour in the washing tub 10 is different, that is, if the drainage capacity becomes low due to, for example, clogging of the drainage hose, smooth drainage is not performed and the water is reduced. Will slow down. Therefore, when the drainage capacity is low, the time required for drainage becomes long.

  According to the fourth embodiment, when the drainage capacity of the determined drainage mechanism is low, the target drainage can be performed by increasing the time of the deceleration section as compared with the case where the drainage capacity is high. It becomes possible, and the effect of preventing reattachment of dirt to clothes in the washing tub 10 can be further enhanced. When the drainage capacity is relatively high, the time for the deceleration section can be relatively short, so that the time for the residual water dewatering operation is not unnecessarily prolonged. Accordingly, also in the fourth embodiment, as in the first embodiment, the tank cleaning can be performed automatically, and the reattachment of dirt to the clothes in the washing tub 10 is effectively prevented. It is possible to obtain an excellent effect of being able to.

  Although not shown, the fifth embodiment can be configured as follows. That is, when the amount of cloth in the washing tub 10 detected by the cloth amount detecting means is large, the control device 21 increases the water level in the washing tub 10 for starting the residual water dewatering operation as compared with the case where the cloth amount is small. Can be configured.

  According to this, when the amount of cloth is large, the residual water dewatering operation can be started at a relatively high water level. In this case, water is lifted up to the upper part by the centrifugal force, and it is possible to wash to a high position on the outer surface of the washing tub 10 and the inner surface of the water tub 4, and it is possible to prevent unwashing from occurring in the upper part. When the amount of cloth is small, the residual water dewatering operation is started at a relatively low water level, so the time of the deceleration section is relatively short, and the time of the residual water dewatering operation is not unnecessarily prolonged. Further, before starting the residual water dewatering operation, the clutch mechanism 17 is in a state where the water level is relatively high and clothes are floating in the water in the washing tub 10, that is, in a state where the resistance in the rotational direction of the washing tub 10 is low. Switching can be performed smoothly.

  In each of the above embodiments, the residual water dewatering operation is started at a predetermined water level in the washing tub 10, but the water level at which the residual water dewatering operation is started is changed according to, for example, the amount of clothing cloth. Also good. Therefore, when the water level in the rinsing is lower than the predetermined water level for the residual water dewatering operation, additional water supply may be performed by the water supply mechanism 25 to obtain the predetermined water level. In the second embodiment, the time of the deceleration section is changed depending on both the amount of cloth and the quality of the clothes. However, the time of the deceleration section may be changed based on one of them.

  In each of the above embodiments, the target rotation speed of the washing tub 10 in the residual water dewatering operation is fixedly provided. However, when the cloth amount is small (light) based on the cloth amount detection, the target rotation speed is set. It is possible to make a change such as increasing the value higher than usual (for example, 180 rpm). Moreover, when the possibility of unbalanced rotation of the washing tub 10 is detected during the residual water dewatering operation, it is possible to perform control such as lowering the target rotational speed than usual (for example, 120 rpm). The fixed number of rotations during the standby time can be changed as appropriate.

  In addition, the specific numerical values such as time, the number of rotations, and the water level described in each of the above embodiments are merely examples, and can be appropriately changed and implemented. Furthermore, various changes can be made to the hardware configuration of each mechanism of the washing machine. The above embodiments are presented as examples, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 1 is a washing machine, 4 is a water tank, 7 is a drain valve (drainage mechanism), 9 is a water level sensor, 10 is a washing tank, 12 is a pulsator (stirring body), 15 is a drive mechanism, 16 is a washing machine motor, Reference numeral 17 denotes a clutch mechanism, 21 denotes a control device, 24 denotes an operation panel, 25 denotes a water supply mechanism, 27 denotes a water supply valve, 31 denotes a rotation sensor, and 32 denotes a current sensor.

Claims (9)

A tank,
A washing tub provided inside the water tub for storing clothes;
A drainage mechanism for draining from the washing tub;
A drive mechanism for rotationally driving the washing tub;
A control device that controls each of the mechanisms to perform washing, rinsing, and dehydration processes;
The control device accelerates the laundry tub to a target rotational speed in a state where water of a predetermined water level remains in the washing tub between the rinsing and the subsequent drainage during the rinsing process. Execute the residual water dehydration operation including the acceleration section and the deceleration section that rotates the washing tub at a reduced speed from the target rotation speed while performing drainage by the drainage mechanism,
The washing machine that makes the degree of deceleration in the deceleration section smaller than the degree of deceleration during deceleration in a normal dehydration process.   2. The washing machine according to claim 1, wherein the control device provides a waiting time for maintaining the rotation speed of the washing tub in a constant state in the middle of the deceleration section of the residual water dewatering operation. A cloth amount detecting means for detecting the volume of the clothes in the washing tub;
2. The washing machine according to claim 1, wherein when the amount of cloth detected by the cloth amount detection unit is large, the control device lengthens the time of the deceleration section of the residual water dewatering operation as compared with a case where the amount of cloth is small. A cloth amount detecting means for detecting the volume of the clothes in the washing tub;
3. The washing machine according to claim 2, wherein when the amount of cloth detected by the cloth amount detection unit is large, the control device lengthens the waiting time in the deceleration section of the residual water dewatering operation as compared with a case where the amount of cloth is small. A cloth quality detecting means for determining the cloth quality of the clothes in the washing tub;
When the cloth quality of the clothes detected by the cloth quality detection means is difficult to drain water, the control device is configured to reduce the time of the deceleration section of the residual water dehydration operation as compared with the case of the cloth quality that easily drains water. The washing machine according to claim 1, wherein the length of the washing machine is increased. A cloth quality detecting means for determining the cloth quality of the clothes in the washing tub;
The control device waits in the deceleration section of the residual water dewatering operation when the cloth quality of the clothing detected by the cloth quality detection means is difficult to drain water compared to the cloth quality that easily drains water. The washing machine according to claim 2, wherein the time is lengthened. A drainage capacity judging means for judging the drainage capacity of the drainage mechanism;
2. The washing machine according to claim 1, wherein when the drainage capacity determined by the drainage capacity determination unit is low, the control device lengthens the time of the deceleration section of the residual water dewatering operation as compared with a case where the drainage capacity is high. A drainage capacity judging means for judging the drainage capacity of the drainage mechanism;
3. The washing machine according to claim 2, wherein when the drainage capacity determined by the drainage capacity determination unit is low, the control device lengthens the standby time in the deceleration section of the residual water dewatering operation compared to when the drainage capacity is high. . A cloth amount detecting means for detecting the volume of the clothes in the washing tub;
The said control apparatus raises the water level in the said washing tub which starts the said residual water dehydration operation compared with the case where there is little cloth amount detected by the said cloth amount detection means. A washing machine according to claim 1.

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